#include<bits/stdc++.h>
#define ll long long
using namespace std;
int rd()
{
	int x=0,f=1;
	char c=getchar();
	while(!isdigit(c))
	{
		if(c=='-')
			f=-1;
		c=getchar();
	}
	while(isdigit(c))
	{
		x=x*10+c-48;
		c=getchar();
	}
	return x*f;
}
int main()
{
	freopen("arena.in","r",stdin);
	freopen("arena.out","w",stdout);
	
	return 0;
}
